Heat motor actuated device



H. E. MALONE HEAT MOTOR ACTUATED DEVICE June29, 1943.

Filed'June 21, 1940 I NVENTOR. HUITZEI", BI I51 Patented 1943 I UNITED STATE s PATENT orrics" HEAT Moron so'rus'rnn nnvion Homer E. Malone, Milwaukee, Wis, assignor to Perle: Corporation, Milwaukee, Wis, a corporation of Wisconsin Application .Iune 21, 1940, Serial No. 341,121

19 Claims.

' to produce a new and improved valve device of the above character wherein the various elements of the valve and of the heat motor are so formed and related that the manuiacturing operations are simplified, and reliable operation or the device is attained.

A further object is to provide a heat motor construction for operating valves and the like which provide new and improved operating characteristics. v

A further object is to provide a heat motor operated valve wherein the pressure responsive elements of the valve operator is housed in a novel and convenient relationship within the valve casing and wherein the assembly op rations involved in mounting the heat motor on the valve casing are relatively simple.

A further object is to provide a heat motor operated valve wherein the various elements are flrst assembled in a group of sub-assembly units for subsequent completion of the assembly operations.

Aiurther object is to provide a heat motor operated valve embodying a manual actuator for opening the valve when electric power is not available, the manual operator being arranged to cooperate in a novel manner with a recycling switch through the operation of which the manual operator isreleased upon the return of power.

In devices of this character the expansible and contractible chamber preferably comprises an outer wall formed by a cup-shapednon-expansible member and an inner wall formed by an extensible bellows of generally cylindrical form.

At one its ends the bellows is-usually anchored and sealed with respect to the open end of the cup-shaped member, while the other end of the bellows projects into the cup-shaped member and is sealed y a cross plate or disc. Thus the expansible chamber comprises the annular space between the bellows and the cup-shaped m'em-- her. The pressure fluid is customarily introduced into the chamber through the cup-like outer wall which is stationarily mounted, and the movement of the inner wall or bellows is transmitted to the valve member by a central stem attached to the plate or disc which closes the inner end of the bellows. a

It is a further object of the present invention to provide a heat motor mechanism wherein the stem whichisconnectedtothe closed end of the bellows serves as the passage for transmitting the pressure fluid from the generator or boiler to -'the expanslble and contractible chamlzoenthereby simplifying the construction valve 'deviceasawhole; l I

Another object is to provide a valve device wherein the movable parts oi the valve and the fluid pressure actuator are guided by means which are or a simple character and are incorand assembly oi the porated in the device so aato serve other runetions, thereby to promote economical manuiacture of the device.

Another object is to provide a valve device which is so constructed and arranged that a bodying the features of the invention arrangement in which the present damper armmay be readily incorporated therein for operation of a damper in timed relation to the opening and closing movement of the valve.

Another object is to provide a heat motor operated valve deviceof the above character where.

in the collapsible bellows of the fluid pressure responsive actuator is so disposed and arranged that it is protected from the deteriorating action of a controlled fluid such asfuel gas.

A further object is to provide a device of the character wherein the heat motor unit is so constructed and arranged that the operation oi illiing the unit with voltatile fluid may be readily and easily performed; and a more specific object is to privide such a unit wherein the liquid system may be readily and easily fllled in the originalmanufacture, or may be opened and re-iilled for purposes of repair, without danger 01' diarupting. the various Joints and connections formed in the liquid-enclosing structure.

Other objects and advantages reside in certainieatures of construction, arrangement and inatter be more fully described in the specification and particularly pointed out in the appended claims, and of which a preferred embodiment is illustrated in the accompanying drawing.

In the drawing: Fig. l is an end elevational view partly in section of a heat motor operated valve device cm- Fig. 2 is a view taken along the line $4 of Fig. 1 showing most of the parts incross section so t to disclose the internal construction;

Fig. 3 is a sectional top view takenalong the line 3-4 of Fig. 2; i

Fig. 4 is a view similar to Fig. 1 oi the upper portion of the device showing'tbe valve manually opened; while a 7,

Fig. 5 is a wiring diagram illustrating-a circuit may be employed.

For the purpose oi disclosure, the invention is I herein illustrated as embodied in a valve device having a valve bodyor casing ii at its lower end and which carries a heat motor ilupon its upper end. The valve casini1i ha's'an inlet ll and an so outlet i4, and between the inlet and outlet an operationof the various parts which will herevalve device a interior division wall or partition is extends. The division wall l5 has a valve opening or port it formed therein, the lower edge of which constitutes a valve seat. The division wall i5 divides the valve casing into an inlet chamber I] and an outlet chamber l8. Within the outlet chamber i8 a valve member I9 is positioned, this valve member I9 beingcarried by the lower end of an axial valve stem 2| whereby it maybe moved upwardly into engagement with the valve seat 20 to close the valve port i6, or may be moved downwardly away from the valve seat 20 so as' to open the valve port and permit the passage of fluid from the inlet l3 to the outlet H. The valve seat 20 is preferably constructed of a rubber composition and is recessed into the division wall I5 as shown. The valve member I9 is loosely supported from the end of the stem 2| in a manner to provide a limited amount of play when the valve member is seated so that any unevenness of the valve member is or axial misalignment of stem 2| is readily compensated for. The elements for providing the lost motion of the valve member is include a hollow'stud 22 threaded into the valve member l3 and a second hollow stud 23 arranged inside the hollow stud 22 and threaded upon the end of valve stem 2!. The valve member it rests against a shoulder edge 24 on the upper end of stud 23, and a. certain amount of play is thereby permitted around this shoulder due to the spacing between the adjacent walls of studs 22 and 23 and between the valve stem 2! and valve member I 9 as shown. With this type of swivel construction it will be clear that a fluid-tight seal is provided, preventing the escape of fluid from chamber ll to i8,.

since the stud 23 threads into valve member l9 and stud 23 into valve stem 2 l The valve stem 25 extends upwardly into the inlet chamber ll where it is operatively assocl-' ated with the heat motor it. The heat motor i2 is carried by and partially housed within an upwardly extending bell-shaped housing i la formed as an integral part of the upper portion of valve casing ill.

The heat motor l2 comprises a stationary power unitindicated at 25 wherein fluid pressure is developed, by the heating of a volatile liquid, for a movable actuating unit indicated at 26 wherein the fluid pressure thus developed is applied through pressure responsive means to the valve stem 2| so as to operate the valve.

The stationary "unit 23 of the heat motor ii hich spans the open upper end of the bell, housing Na and is secured thereto by means such as screws 23. This plate 27 is preferably dished upwardly so as to have side wall portions above the level of the bell housing Na and thereby provide working space above the level at which the 1 through the mounting plate 21, and the tube 28 extends downwardly in coaxial relation to-the bell housing] In and the valve stem 2i to a point somewhat above the upper end of the valve stem 2i. The fluid pressure developed by the power unit is transmitted through a central bore 33 .of the tube 83 to an expanslble'and contractible chamber 3|, the movable element of which is operably asscciated'with the valve stem 2|. In

its preferred form the valve chamber Si is formed by a relatively rigid cup-shaped member 82, the

bottom wall 33 of which is secured co-axially to the upper end of the valve stem 2| as by riveting and soldering. The cup-shaped member 32 forms the outer wall of the chamber 3|, and the inner wall of the chamber 3| is formed by a disc 34 secured to the lower end of stationary tube 29 and a collapsible bellows 35, made from a flexible material such as bronze, extending between the outer edge of the disc 34 and the upper end of the cup-shaped'member 32. The connection of the bellows 33 at its upper and lower ends is fluidtight so that the chamber 3| comprises the space between the bellows 35 and the side walls of the cup-shaped member 32. As herein shown the upper end of the bellows 35 is crimped about the inwardly extending flange of an annular ring 36, and as the bellows 35 is put in place in the cupshaped member 32, this ring 36 is forced into the top of the member 32. The joints between the ring 36 and the bellows 35 and between the ring '36 and the cup-shaped member 32 are then soldered to attain the desired seal. With this arrangement when the pressure fluid is forced through the tube 33 into the chamber 3 I, the cupshaped member 32 is forced downwardly and the bellows 35 is collapsed or contracted, thereby moving the valve member is downwardly away from the valve seat'20.

In the embodiment of the invention the mounting plate 27! has one or more apertures therein for purposes tobe hereinafter discussed, and

R since the inlet chamber H extends about the cupcarried on a dish-shaped mounting plate 2? v 1 upon the clamp plate shaped member 32 within the bell housing a, sealing means is provided in such a manner between the bell housing and the cup-shaped member 32 so as to allow shifting movement of the cup-shaped member 32 and yet prevent the escape of fluid about the upper end of the member 32. This sealing means also serves to'protect the bronze metal of the bellows 35 from the deteriorating action of the fluid which is flowing through the valve casing ii. This undesirable action upon the diaphragm would-be quite pronounced if commercial fuel *gas were allowed to come in contact with the bellows. Where the use of the valve is such that the plate ,21 may be made imperforate, and the controlled fluid is of such a character that it will not deteriorate the bellows, this sealing means may, of course, be eliminated. In the present instance this sealing means takes the form of a flexible diaphragm 3? made from amaterial such as leather which is impervious to the passage of the controlled fluid. The outer edge of the diaphragm 3'? is clamped between the opposed peripheral edges of the mounting plate 2'! and the bell housing Ha, while the inner peripheral edge of the'diaphragm 31 is clamped between an outwardly extending flange 33 at the upper end of the cup-shaped member 32 and an overlying-clamp 39. The clamp plate 39- has a central opening therein which slidably surrounds the tube 29 and is clamped against the top of the flange 38 by a, plurality of screws 40. An expansible coil spring M surrounds the tube 29 within the bellows 35, and acts at its opposite ends against the disc 34 and the clamp plate 39. Since the disc 36 is stationary, the spring it acts 33 and through the cupshaped member 32 to urge the valve member 19 upwardly to its closed position. Thus the" bellows 35 and the cup-shaped member 32 form a fluid pressure operated device wherein the cup-shaped member is shifted longitudinally of in response to variations chamber 3L.

the stem 23 to the upper end of the cup-shaped member 32.

- endflts into the upper end bore of the tube 2.8

iaaaaras I 'apertureoi the plate as rides along the stem or tube 29 so as to impart a lateral'guiding, action The power unit 2!, which functions to generate the fluid pressure for operating the actuating "means 26,:preterably comprises a generator or boiler 42 heated by means such as an electric heater 43 so that a volatile liquid, Preferably acetone, contained within the boiler 42 maybe vaporized by the electric heater to build up fluid pressure in the boiler. This fluid pressure within the boiler forces the remainder or unvaporized'portion of the fluid from the boiler 42,

through a-connecting tube 44, into the tube II and the fluid pressure responsive chamber Ii.

The boiler 42, as herein shown, comprises an infrom in downward direction, and the upper end of the connecting tube 44 extends into this nipple ,48 and is silver soldered in place. The tube 44 is of relatively small cross section, and its lower andis soldered therein. i

'- an extremely smallmass, and the heater 43 is The electric heater 4! is formed by a plurality 01' turns of highresistance wire wound about the boiler 42 with a layer of insulating material such as mica interposed between the boiler and insulating wire. In accordance with the present invention the boiler 42 is constructed so as to have located about the lower portion of: the outer i cylindrical surface of the boiler 42, since it has been found that through the use of this construction', the operating characteristics or, the valve are materially improved. This improvement in the operating characteristics oi. this valve is con, cerned principally with the rate of movement of the valve member during the initial portion oi its opening movement and during the terminal portion of its closing movement; but in addition,

this construction results in a material reduction :inthe time which elap'us betweenthe de-energication of the heater 43 and the completeciosure oi the valve, port I.

Inoperation, with the heater4ll0cated about the lower portion only of the boiler as stated, the 50 greater portion of thebody oi 'iiuid in the boiler 42 is heated substantially to the-critical or vaporizing temperature before vaporization starts. Hence alter the vaporization begins, itprogresses ap dly so as to produce rapid movemento! the 66 valve memberfro'm its fully closed position toward its open position; This rapid movement continues throughout substantially "movement of the valve." I U -v. When thevaive member ll reaches its iully open position, the liquid is driven entirely out of the boiler 42 to an approximate point as indicated I at 41 'in the tube 44, so that theboiler is filled condition without requiring undueh'eat output or.

1 undue heater capacity. It willbe' evident, of course, that the upper portion oi the thin-walled boiler 42 will at all times 'rem'ainata slightly lower temperature'than'the lower portion of the boiler,

[ the' entire opening. 7

heater 42 and is exposed for radiation the surrounding air. a

When the heater 4! is de-ener'gized, the entire boiler and heater structure will start to cool.

- and while the initial portion of the valve clos-- ing movement may be relatively slow whllethe I heat in the heater is being dissipated, it will be evident that the'upper portion of the boiler 42 has such low-heat inertia that after the rela- 10 tively cool liquid has started its return flow into the boiler, the heat remaining in the walls will be rapidly dissipated so that the last or terminal portion of the closing movement of the valve member I! invariably takes place at a rapid rate. '35! so proportioning the" heater 4! that the heat applied thereby to the lower portion of the boiler is only slightly more than is required to maintain the valve in its open position, and by use of a boiler of small. mass with a large area of its upper portion; exposed as a radiating surface, it has been found that the total .time required between de-energization of the heater 43 and the complete closure of the valve is materially reduced, and the operating characteristics of the valve are materially improved.

The heat motor I2 is provided with a supporting plate formed of insulating-material, and

supported parallel to the top of the mounting plate 21 and spaced upwardly asubstantial dis-,

tance therefrom. The plate 48 is held in position by a pair of spacing sleeves 49 arranged between thev plate 4! and. the plate 21 and screws 50 extending through the plate 48 and the sleeves 48 and threaded into the p1ate,21. The,

plate 48 has a central opening 51 therein which surrounds the boiler'42 above the heater 43 and acts to impart lateral'support to the boiler. In

- the present instance the plate 48 is located sub-' stantially midway -betweenthe upper and lower 40 endsof the boiler 42. 0h its lower surface the plate 40 has a pairof U-shapedbracket members 52 and 53 mounted in fixed relation and each bracket has one arm. 54 projectingdown- 'wardly adjacent one side of the plate '48 and another arm 55 projecting downwardly adjacent ially through the top of the cover It, and threaded into a U-shaped bracket 58, the bracket 58 being carried on the, top of the plate 42 and ex-- tending upwardly oyer' theupper end of the boiler 42 so as to protect. the boiler 42 from damage. r 1 In order toprovide for the electrical wire connections'of thedevice, a terminal plate 59 of plate 21' and is held in place against a recessed 7 portion oi' the supporting plate 4! by the cover .14 as seen in Fig. 3. A number oi. wire terminal clips II for attachment: of the internal wires ILtOgether with the associated screws 2a 2b and flcior attachment of the external 11100111.-

clips to serve for the attachment or the small the bracket arms .54. Aconduit bushing. i3 is attached to the outside, of the cover 50 by screws l4 and serves. as a means for the, attachment oi-the conduit carrying the-incoming elecsince this upper portion is remote from the 7c trical conductors; f

ot'heat to insulating material is arranged on topoiflthe ing wires (not shown), are secured tooppositesidesoi'the-terminai plate ".1 The terminal" leads ll extending to" the electric heater 43 and edge thereof.

Since the present power unit 25 is dependent I for its regular operation upon continuance of the electrical power supply, thepresent valve is preferably provided with a manual operating 'means whereby the valve may be opened dur-' ing the absence of electrical power. In the present instance this manual operating means oomprises a vertically shiftable' plunger 66 which is in the form of a fiat metal strip having its upper end bent to a horizontal position to pro-- vide a finger piece 61. The plunger 66 extends downwardly and the plate 39, the cup-shaped member 32, and the valve carrying stem 2! are thereby forced downwardly against the force contact switch. 71, this switch "serving as a recycling means to again place the heat, motor l2 under the control of its automatic control means after the return of electrical power.

of the spring M to their valve opening position. 7

It will be noted that in the application of th s manual valve opening force, the upper end of the pressure responsive device 26 is guided bythe sliding engagement of the plate 89 with the stem 29, but there may be a tendency to tip or tilt the plate 39 and the associated parts at the side where the plunger 66 is pressing down. Means is therefore provided to impart a similar guiding action to the lower end of the In the present instance. this valve stem 2|. means includes the hollow stud 22 located in co-axial relation to the stem 2| beneath the valve.l9, and this guiding stud 22 rides loosely in a guide washer member ll which is carried .axially on the inner face of a removable plug 12. The removable plug 12 has a hollow portion stantly against the insulating strip 14, as seen in in Fig. 3. When the. manual valve operating- "I3 and is threaded intothe bottom opening of.

the body II, which opening is of sufficient size to allow the valve member l9 and associated ele- "ments to be inserted and assembled therethrough into the valve body casing H. Th" guide washer ll comprises an apertured. stamping which is fastened in-the relatively large bore 13 to. the periphery of plug 12. The bore I3 is quite large in diameter and the apertures in washer ll permit any foreign matter to accumulate in the hollow bore 13 and hence the possibility of blocking of the valve is practically negligible.

Returning now to the manual actuator 86, means is provided for. latching the actuator 88 in its valve opening position. 'In the present instance this latching means comprises an insulating plate 14 secured on oneside of the plunger 66 together with a. metal-strip l5 arranged in such a position that its upper and provides a shoulder 76 which may be engaged with the lower face of the plate 48 when the plunger 68 has been depressed to its valve. olpening positionand the spring 4| compressed. Such latching engagement isattained by shifting the upper end of the plunger- 66 laterally or to the right after it has been depressed. When the plunger is to'be released, it is depressed slightly from its latched relation and by means of a constantly applied yielding force is urged laterally in the other direction or to the left so as to release the shoulder I8 from its latched engagement with the plate 48. Inthe present instance this yielding force is applied by means ofo'ne of the elements of a normally open spring As shown in the schematic diagram of Fig. 5, the heater 43 is energlzedby low-voltage current from the low voltage secondary winding of a transformer 18 having its primary winding connected to a source of high voltage alternating current. The transformer secondary winding is connected to the screw terminals 520:

and 621). An automatic control device such as a snap acting room thermostat 19 of conventional design is connected to the screw terminals 62b and 62c. The electric heater is connected by the wires 6| to the wire clips 60 on screw terminals 62a and 620, while the recycle switch contacts Tl are connected through the bracket legs 54 of brackets 52 and 53 to the wire clips to of screw terminals 62b andg62c.

When the, thermostat it! closes its contacts in response to a call for heat, a heater circuit is established including the wires and terminals 62b and 620, the secondary of the transformer 18, the terminal 62a, through the heater, as and back tothe terminal 62c and the thermostat 79. The heater 01 the heat motor is accordingly energized,

The recycling switch II is disposed, in an electrical sense connected in parallel with the thermostat is between the two terminals 82b and 620 shown in the wiring diagram. In practice, the recycle switch 11 comprises a pair of spring blades 80 and BI mounted one on each of two depending arms of the brackets 52 and 5a. The blade at is so biased that it tends .to move away from the blade 8| and to bear conplunger 66 is pressed downwardly to open the valve and is moved to the right so as to latch the valve in its open position to the position shown in Fig. 4, this lateral movement of the plunger 66 and its insulating strip 14 serves to close the switch contacts 11. During such closure the bias of the spring blade. tends to move the plunger 86 to the left or to its unlatched position, but the upward pressure of the spring II issuch thatthe spring blade 80 is inefiective to release the plunger 86 so long as the tension of the spring it maintains the plate 39 in engagement with the lower end of the plunger 68; The position to which-the valve member i9 is actuated by the manual operator or plunger 66 is somewhat less than thefully opened position of the .valve member l9. Hence by operation of the heat motor 25, when the valve is latched'manually open the valve may be given an additional unlatched position of Fig. 1.

opening movement, to thereby shift the plate 39 downwardly away from the end of the plunger 66; When such operation takes place the force .of the spring blade 80 is sufficient to shift the plunger 88 laterally to the left to its released or When the valve is manually operated to its partially open position, a. suction is produced inthe boiler so that a vacuum space is created in the boiler top as seen in the circuit the heater is energized and the valve is actuated toward its extreme open position tothereby unlatch the manual actuator. This unlatching of the actuator it results in the opening of the switch 11, and if the thermostat 19 happens at this time to be open,'the heater I2 i de-energized and the valve returns to its closed position. If, on the other hand, the thermostat "is closed at this time, the'heater 42 remains energized and the valve is' maintained open until such time as the thermostat 19 acts in its normal manner to break the heater circuit.

In the manufacture of the present device the assembly of the parts is relatively simple. In such assembly the valve stem 21 is first connected to the cup-shaped member 32. A filling and sealing tube 82' is then inserted into the bore of thevalve stem 2| and is sealed therein by means of a soldered Joint indicated at 82, this fer to delay the mounting of the diaphragm until all of the required soldering operations have accomplished. I Since the leather is thin and relatively stretchable, it' may be worked over the flange 38 and into the clamping space after the above described assembly operations have I been accomplished.

soldered joint being formed at the lower end of the valve stem 2| so that in the event that the volatil liquid requires replenishing", the refilling or replenishing operation will be simplified. The tube 29 next has the disc 34 secured thereto by The various elements which are associated with the insulating plate 42 are connected in a sub-assembly operation. The plunger 68 is in-'- serted through the guide opening 69 and a stop pin 86 riveted on the plunger 66 beneath theplate 42 limits upward movement of the plunger. Above'the plate '48 the plunger 68 has an angle bracket 81 secured thereto, and formed out of .the strip 15. In the sub-assembly the pin 22 and the angle bracket 81 act to retain the plunger '8 on the plate 48. The two brackets .52' and 53 and a suitable riveting and solderingoperation, and

' r the lower end of the bellows 35 is interlocked and suitably sealed onto the outer edge of the ,disc :4, while the upper end of uie'beuows as is crimped to the ring 28. The tube 29, with the the top bracket 58 are also secured to the plate 48 in the sub-assembly operation. This subassembly is then positioned on the mountins plate 21 and is secured in spaced relation thereto plate and the bellows 35, is then inserted'into the cup-shaped member 32 and the upper end of the bellows is sealed by soldering of the ring 38 at its joints with the bellows and the upper portion of the cup-shaped member .32. The spring H is then placed within the bellows, the plate 3| preferably being depressed about the tube 29'so as to accurately position the lower end of the spring H. The plate 39 is then placed in position over the cup-shaped member 82, and the central opening of the plate 29 preferably has a downwardly extending lip which extends into and accurately positions the upper end of the spring 4 l. A relatively small connecting plate 24 is then positioned over the reduced threaded upper end of the tube 29, and is clamped in place on the tube2 9 by a nut 85 which is threaded onto the reduced upper end of the tube 29. The tube N is then inserted into the tube 29 and is soldered therein, it being understood that the boiler by the spacing sleeves l9 and thescrews 50.

The sub-assembly which is thus formed, and

which includes the plate 21 and the plate 48, is then placed in position over the boiler 22 with the, boiler .passing through the opening in the plate 21 and so that the relatively small securing plate 84 is located beneath and in engagement with the lower surface of the plate 21.

The plate I4 is then securely connected to the plate 21 by means of a plurality of screws 28.

.In the mounting of the heat motor I! on the valve casing- H, the outer edge of the diaphragm 31 is clamped between plate 21 and the upper end of the bell housing Ila. After the heat motor is in place the valve member I! is secured in position on the valve stem 2| by means of the guide bushings 22 and 23, and the plug 12' is then threaded in position in the bottom opening of the valve casing. The terminal plate 52 is next placed upon the plate 21 with its lower edge resting in notches in the plate21 and its upper end placed in the recess of plate 42. The cover I6 is then placed over the assembly so that it holds 42' has previously been mounted on the tube ll.

The boiler 22 and the chamber 3| may then be filled with the volatile liquid. This, volatile liquid may be any one of a number. of commercially available liquids, and preferably one such as acetone. This liquid is forced into, the chamber il and the boiler 42 through the tube 82 which at this time has its'lower end open and projecting a considerable distance from the lower end of the valve stem 2L, After the filling operation the tube 82 is pinched closed at It closely adjacent to the lower end of 'the valve stem 2|, and is soldered closed. It will be noted that the filling tube 82 is remotely located with reference to the boiler 42, so that the filling operations, in e ther the original manufacture or in subse quent repair, may be performed ,without danger of disrupting the other joints or parts of the I fluid system. This relationship is of particular theplate 59 in, place, after which the conduit bracket 83 is attached to the cover by the screws 84, as seen in Fig. 3. The cover is held in place by the screw Q1 threaded into bracket 58. The

. internal electrical connections 6| between the isnormally retained in this elevated position mportance in thatfit enables the boiler to be made of extremely thin materials and thereby makes itpossible to produce a boiler of er'rtremely low mass. a 1

The heater 43 may bewound upon-the boiler 42 either before or afterthe mounting of the boiler on the tube". The. mounting of the dianhragm 31 between the flange 20 and the plate l9 mav also be accomplished at various times in the assembly operation, but since the diaphragm heater 43 and the clips 60 and between the bracket legs II and the clips", as seen in Fig- 3, are made before the cover 56. is placed in position. The cover It is arranged in position on the heat motor assembly so-as to protect and house the various elements of the boiler, theheater, and the recycling means, and itwill be noted that the angle bracket 21 serves to partially close the opening ll when the 'plunger I. is in its elevated position, thereby preventing the entrance of dust through the opening II. The plunger dueto the frictional action induced by the sprin action of the contact blade II. when the guide bushing 22 has beenput'in place, it serves-the additional function of surrounding and protectingthe end 23 of the filling tube 22..

Incertain types of installation, it is desirable to operate a furnace damper or other control means in coordinated relation to the opening and closing of the valve, and for thispurpose the present valve devicev is provided with alever arm I! pivoted on a horizontal pivot intermediate its ends at 20 on a bracket 2|. The'bracketfl is is preferably formed of a flexible leather, I pre-' located on the upper face of the mounting plate 21 adjacent the edge thereof and is held in place by certain of the screws 18. The right hand arm of the lever 89 projects away from the valve device for connection with the control device or damper which is to be operated, while the other left hand end extends through an opening or slot in the upwardly sloping portion of the plate 21. This end extends over a notched edge of the plate, and is connected by a pin and slot joint 92 to a bracket 93 which is fixed on the upper face of the plate 39 by one of the screws 40. The lever 89 is thus rocked about its pivot 90, in coordinated relation to the valve movements;

In certain installations it may be necessary to provide for a continuously lighted pilot, and a plugged orifice 94 in the inlet chamber I! is provided for the purpose shaped member and said bellows, means operatively connecting said cup-shaped member tosaid valve member, and sealing means for preventing contact of thefluid in said bell with said bellows.

2. A heat-motor operated valve of the char- "acter described: comprising, in combination, a

understood that the invention is not limited v thereto, and many variations will be readily ap-' parent to those skilled in the art, and the invention is tobe given its broadest possible interpretation within the term of the following claims.

What is claimed is: r I r p l. A heat-motor operated valve of the character described comprising, in combination, a valve casing having inlet and outlet openings and an internal division wall between said openings defining inlet and outlet chambers and having a valve port in said division wall providing for com-,

munication between said chambers, a valve member for closing said port, said valve'casing having a mounting bell portion extending therefrom and forming a continuation of one of said chambers aligned with said valve opening, a heat motor unit mountedon said bell portion and operatively connected to said valve member, said heat motor unit comprising means including a mountingmember spanning the end of said bell portion, a fluid pressure operated expansible and contractible unit carried by said mounting member and housed within said, bell portion, and an electrically heated fluid pressure generator unit mountedon said mounting member exteriorly of said mounting bell portion, s'aidiluid pressure operated unit comprising a stationary central tubular stem, havingone end fixed to said mounting member andcommunicating with said pressure" generator, said stem extending from said mounting member axially into said mounting bell and toward saidvalve port, an expansible and contractible bellows surrounding said stem and havvalve casing having inlet and outlet openings and an internal'division wall between said openings defining inlet and outlet chambers and having a valve port in said division wall providing for communication between said chambers, a valve member for closing said port, said valve casing having a mounting bell portion extending there-- from and forming a continuation of one of said chambers aligned with said valve opening, a heat motor unit mounted onsaid bell portion and operatively connected to said valve member, said heat motor unit comprising amounting member spanning said bell portion, a fluid pressure operated expansible and contractible unit carried by said mounting member and housed within said bell portion, and an electrically heated fluid pressure generator unit mounted on said mounting member exteriorly of said mountingbell portion, said fluid pressure operated unit compris-- ing a stationary central tubular stem having one end fixed to said mounting member' and communicating with said pressure generator, said stem extending from said mounting member axially into-said mounting bell and toward said valve port, an expansible and contractible bellows surrounding said stem and having one end secured to the other end of saidstem in fiuidtight relation, the secured end of the bellows being between the other end of said bellows and the valve port, a; relatively rigid" cup-shaped member axially aligned with said valve port, said cup-shaped member enclosing said bellows and having its transverse wall positioned facing said valve port, the other end of said bellows being joined to the side wall of said cup-shaped member in fluid-tight relation, means providing a fluid-tight seal between said cup-shaped mem-- her and said bell portion whereby to permit movement of said cup-shaped member toward and away from said-valve port while preventing the passage of fluid from said bell portion, said tubular stem communicating with the chamber formed between said cup-shaped member and said bellows, and means operatively connecting said cup-shaped member to said valve member.

3'. Aheat-motor operated valve of the character described comprising, in

an internal division wall located between said openings defining inlet and outlet chambers and having a valve port in said division wall providing'for communication between said chambers, a

ins one end secured to the other end of saidstem I in-fluid-tight relation, the secured end of the locilowsbeing-betWecn the other end of said bellows and'the valve port, a relatively rigid cup-shaped member enclosing said bellows and having. its

transverse, wall positioned facing said valve port,

tight relation, said tubular stem communicating with the chamber formed between said cupthe other-end of said bellows being joined to the side wallof' said cup-shaped member in fiuid-.

valve member for closing said port, said valve casing having a mounting bell portion extend:

ing therefrom andforming a continuation of one of said chambers aligned with said valve open-=' mg, a heat motor unit mounted on said bell portion for operating said valve member, said heat motor .unit comprising a fluid pressure operated device and a fluid pressure generator therefor,

said fluid pressure operated device comprising i a cup-shaped outer member, and expansible and contractible bellows having one closed'end and positioned within saidcup-shaped member with its closed end adjacent tothe closed end of said cup-shaped member, the open endsof said bellows and said member bein sealed together to form a chamber therebetw en, a hollow stem portion combination, a valve casing having inlet and outlet openings and extending into said bellows and connected at one of its ends to the closed end thereof so that the bore of the stem communicates with said chamber, a connector plate secured to said stem ad.-

iacent to its other end, said generator being mounted on said other end of said stem with said generator in communication with the bore said stem, a mounting plate having a central opening through which said generator is projected after assembly of the generator and the fluid pressure operated device, means securing saidconnector plate to said mounting plate across the open end of the bell portion,

and means operatively connecting said cupshaped member to said valve member.

4. A heat-motor operated valve of the character described comprising, in combination, a valve casing having inlet and oulet openings and an interior division wall located between said openings and having a valve port therein, a

valve member for closing said port, a heat motor unit mounted on said casing for operating said valve member, said unit including a fluid pressure generator, electric heating means therefor,

and a pressure responsive expansible and contractible device cperatively associated with said generator to expand and contract in response to pressure variations produced in said generator, said device comprisingan inner generallycylindrical. wall formed at least in part by an expansible and contractible bellows and an outer cylindrical wall surrounding said inner wall and secured in sealed fluid-tight relation at one of its ends to the corresponding end of said bellows,

a cross wall closing the other end of said outer wall, means cperatively connecting said cross wall to said valve member, and means supporting said expansible and contractible device comprising a hollow stationary member communicating at one end with said generator and connected at its other end to the other end of said bellows to discharge pressure fluid into the space between said outer wall and said bellows.

, casing having inlet and outletopenings and "an interior division wall between said openings and erated device are supported, electric heater means associated with said generator, an "insulating plate' carried bysaid supportingwall in spaced relation thereto and cperatively engagingsaid generator to impart lateral support thereto at a point spaced from said supporting plate,Iaman-- ual operating member slidably mounted in and ber in avalve opening position, and means on said operating member operable when said member is thus latched to close said recycling switch.

7. A heat-motor operated valve of the'character described comprising, in combination, a valve having a valve port therein, avalve memberfor closing said port, a heat motor unit mounted onsaid casing for operating said valve member, said heat motor unit including an expansible *and contractible chamber operatively associated with said valve member to shift said member between open and closed positions, and a fluid pressure.

generatorcommunicating with said chamber, an electric heating means for heating'said generator, a manual actuator for shifting said valve member to an open position when electric power is not available for energizing said heater, latch means for said actuator, said actuator being shiftable manually from a normal released-position to a latched operative position wherein said valve is.

. partially opened, a normally open switch for con- 5. A heat-motor operated mechanism of thecharacter described, comprising a casing, a control member, a heat motor unit mounted on said casing and operating said control member and including a fluid pressure operated expansible and contractible device operatively associated with said control member and a fluid pressure generator to actuate said device, supporting wall means associated .with said casing and upon opposite sides of which said generator, and said fluid pressure operated device are supported, electric heater means associated with saidgenerator, switching. means' for'controlling said electric heater means, manual means for positioning said control member independently of said'heat motor and for operating said switching means for energizing said heat motor, and

, means operated by said heat motor for operating v saidswitching means. 1

meeting said heating means to the source 01 elec-- t i'c power, said actuator being operable to close said switch when said actuator isin its latched position, said switch includingla'. spring contact arm operable when said switch is closed to apply a yielding force tending to unlatch said actuator, and a, springurging said valve member toward closed relation and operable uponsaid manual actuator while said generator remains unheated to prevent ,unlatching of said manual actuator by 6. A heat-motor operated valve of the character described, comprising a valve casing having inlet and outlet openings and an interior division wall located between said openings and having a -valve port therein, a valve member for closing said port, a heat motor; unit mounted on said casing and operating said valve'member. and in- I cluding a fluid pressure operated expansible and contractible device operatively associated. with said valve member and a fluid pressure generator to actuate said device, a supporting wall associated with said casing and upon opposite s'id of t which said generator and said fluid pressure said spring contact arm.

8. A heat-motor operated deviceof the character described comprising in combination. a

casing, a control member on said casing, a heat. motor unitmounted on said casing for operating said control member, and including an e rpansible and contractible chamber and a fluid pressure generator communicating with said chamber, said generator having walls formed from material of relatively light weight so as to render the gen erator highly responsive to heat applied thereto. means forheating said generator, a connectin stem cperatively connecting saidrexpansible and contractible chamber to said control member, a

'flliing tube for filling said generator and said chamber with a. volatile fluid, said filling tube extending through saidjconnecting stem from one end thereof to said chamber, said filling-tube projecting beyond said connecting stem to facilitat: the closure 01 said filling tube after thefllling operation, andmeans for securing said con- Y trol member in place on said connectingstem,

said last-mentioned means being'operable to enclose and protect said flllingtube.

9. A'heat-motor operated valve of the ter described comprising, in combination, a valve casing having inlet and outlet openings and an charac I I member.

I vice comprising an 7 her,

interior division wall loc ated between said ope ings and having a valve. port therein, a valve member for closing said port, a heat motor unit I mounted on said casing i'oroperating said valve member, and including an expansible and contractible chamber and a fluid pressure generator communicating with said chamber, said gener- I ator having walls formed from material of rela- I tively light weight so 'as to render the generator highly responsive to heat applied thereto, means for heating said generator, a valve stem 1operatively connecting said expansible and contractible chamber to said valve member, a filling tube for -protect saidfillingtube, and a guide in said valve casing in which said guide stem rides during opening and closing movement of said valve 10..In a device ofthe character described compzising, a valve casing having an inlet and an outlet opening and an-interior division wall between sai openings with a valve port therein, a

valve seat around said valve port, a valve member, a valve stem extending through said valve port for operating said valve member into and out of engagement with said valve seat to open and close said valve member'upon said valve stem whereby any unevenness between the valve seat and valvemember is compensated for, said valve member supporting means comprising a first hollow stud secured to'the end of the valve stem and having a shoulder portion upon which said valve member loosely rests, a second hollow stud secured to I the valve member and enclosing-said first hollow stud in a manner to provide anarrow space between, both of said studs, means for operating said valve stem including a'heat motor operated device containing a volatile liquid, a. hollow tube extending through said' valve stem to provide a means for filling the heatv motor with the volatile liquid, the end of said hollow tube being sealed and projecting beyond the valve stem into said hollow studs whereby the sealed hollow tube is the valve port, means for loosely supporting said outer wall and slidably engaging said stem to guide said one end in a lateral sense relative to said stem as the device expands or contracts,

and spring means housed within said inner wall and acting at oneend against said guide plate to urge said device toward its expanded position.

I 12. A pressure operated valve device comprising, a valve casin having inlet and outlet openings and means providing a valve port placing said openings in communication, a pressure responsive expansible and contractible device 10- catcd in said valve casing, said device comprising an inner generally cylindrical wall formed at least in part by a flexible member and an outer generally cylindrical wall surrounding said inner wall and secured in sealed fluid-tight relation at one of its ends to the corresponding end of said inner wall, a cross wall closing the other end of said outer wall, means including said outer wall and cross wall forming flow controlling means for controlling the flow of fluid through said valve port.

means for supporting said expansibleand contractibledevice in said valve casing comprising a hollow stationary stem communicating at one 1 end with a source of controlling pressure and connected to the other end of said inner wall to admit fluid into the space between the outer wall and innerwall, a guide plate connected to said one end of said outer wall and slidably engaging said stem to guide said one end in a lateral sense relative to said stem as the device expands or contracts, and spring means housed within said inner wall and acting at one end against said guide plate to urge panded position."

13. A pressure operated valve device comprising, a valve casing having inlet and outlet openlugs an means providing a valve port placing said device toward its exsaid openings in'communication, a pressure responsiveexpansible and contractible device located in said valve casing in alignment with said valve port, said device'comprising an inner generally cylindrical wall formed at least in part by a flexible member and an outer generally cylin-- drical wall surrounding said inner wall and secured in sealed fluid-tight relation atone of its ends to the corresponding end of said inner wall, a cross wall closing the other en of said outer wall, means including said outer-wall and cross wall forming fiOW controlling means for controlling the iiow of fluid through said valve port,

' means for supporting said 'expansible and conaccessible for filling of theyolatile liquid when the I I studs are removed.

11. A heat motor unit comprising, a fluid pressure generator, electric heating mean therefor, a

pressure responsive expansible and contractible device operatively associated with said generator to expand and contract in response to pressure variations produced in sai -generator, said deinner generally cylindrical wall formed at least said device also including an outer generally cylindrical wall'surrounding said inner wall and secure'd in sealed fiuid-tight relation at one of its ends to the corresponding end of said inner -wall, a cross wall closin the other end of said j outer wall, said cross wall being adapted to actuate a movable member,.means supporting said expansible and contractible device comprising a, hollow stationary stem communicating at one end in part by a flexible memings and means providing a valve port" placing 'with said generator'andconnected to the other and of "said inner wall to admit fiuid into the space between said outers wall an said inner wall, a guide plate connected tosaid one end of tractible device in said valve casing comprising a hollow stationarystem communicating 'at one end with a source of controllin pressure and connected to the other end of said inner wall to admit; fluid into the space between the outer Walland inner wall, guide means connected'to said one end of said outer wall and slidably engaging said stem to guide said one end in a lateral sense relative to the said stem as the device expands or contracts, and means for guidin the other end of said outer wall so as to maintain said expansi- I his an contractible device in alignment with said valve port.

14. A pressure operated valve device comprise ing, a valve casing having: inlet and outlet open said openings in communication, a pressure re- .sponsive expansible and contractible device lo-' cated in said valve casing, said device comprising an inner generally cylindrical wall formed at least in part by a flexible member andan outer I generally cylindrical wall surroundin said inner wall and secured in sealed fluid-tight relation at one of its ends to the corresponding end of said inner wall, a cross wall closing the other end or said outer wall, meansincluding said outer wall and cross wall forming flow controlling means for controlling the how of fluid through said valve port, supporting means attached to the other end or said inner wall for supporting said expansible and contractible device in said valve casing, fluid passage means for communicating a source of controlling pressure with the space between the outer wall and inner'wall, and sealing means between said outer wall and the valve casing for preventing access of the fluid in said valve casing to said inner wall.

Apressure operated valve device comprising, a valve casing having inlet and outlet openings and means providing a valve port plac n said openings in communication, a pressure responsive expansible and contractible device located in said valve casing in alignment with said valve port, said device comprising an inner-generally cylindrical wall formed at least in part by a flexible member and an outer generally cylindrical wall-surroundingtsai irmer wall and ,se-

cured in sealed fluid-tight relation at one of its ends to the corresponding end of said inner wall,

ling the'flow'of fluid through said valve port,

supporting means attached to the other end of ii. In a device of the character described comprising a casing, a control member, a supporting plate arranged in said casing, a boiler supported on top of said supportingplate, a fluid pressure bellows supported below the supporting plate and operatively' connected to said control member, means extending through said supporting plate connecting the bellows with the boiler for operating the control member, an electric heater for the t boiler, an insulating plate arranged in spaced parallel relation to the supporting plate an arranged to providelateral support for said boiler,

and a terminal plate arranged vertically upon said supporting plate with one end thereof engaging the supporting plate and the other end engaging the insulating plate for supporting the terminal plate, said terminal plate having a plurallty of terminals thereon for the connection of wires extending to the electric heater and for external connections.

18. A heat motorunit comprising, a fluid pressure generator, electric heating means therefor, a bellowshaving a closed end and an open end. the open en oi the bellows being adjacent and below said generator, means including hollow connecting means extending downwardly from the fluid pressure generator through the open end said inner wall for supporting said expansible I and contractible device in said valve casing, fluid passage means for communicating a source or controlling pressure with the space between said outer wall and the valve casing, sealing means for sealing the valve casing and preventing-access of fluid in said valve casing to said inner wall, and guide means for maintaining said flow controlling means in alignment with said valve port.

16. A'heat motor unit comprising, an elongated cylindrical fluid pressure generator having its axis extending vertically, said generator having a thin sidewall of high heat conductive material so as to be highly responsive to heat applied thereto, an electric heater associated solely with the lower portion of the side wall of the generator whereby the thin upper portion i exposed so as to radiate and conduct heat tothe surrounding media, a bellows located below the generator, said bellows having a closed end and anopen end, the axis of said bellows being in substantial alignment with the axis of said generator and the open end of the bellows facing the generator. a generally cylindrical cup-shaped member surrounding said bellows, means attaching the open end oi the cup-shaped member and the open end oi! and cup-shaped member,'means including hollow connecting meansextendlng from the fluid pressure generator through the open end or the bel-.

lows and secured to the closed end thereof, said last recited means maintaining a flxed distance, between the generator and the closed end or the bellows and placing the interior or the generator in communication with the sealedspaoawhereby upon heating or the generator by the-electric heater the generator and the end vot-the sealed space nearer thereto become further open end-of the bellowstogther in a fluid tight manner so as to form a sealed space between said bellows and cup-shaped member, said hollow connecting means maintaining a fixed distance between the generator and the closed end of the bellows and placing the interior or the generator 5 a Y in communication with said seale space, whereby upon heating of the generator by the electric heater the generator and the endoi' saldsealed space nearer thereto become further separated.

19-. A heat motor unit comprising, an elongated cylindrical fluid pressure generator having its axis extending vertically, said generator having a thin ,side wall of high heat conductive material so as to be highly responsive to heat applied thereto, an electric heater" associated with the generator, a bellows located below the generator, said bellows having a closed end and an open end, the axis of said bellows being in substantial alginment with the axis of said generator and the, open end 0! the bellows racing the generator, a generally cylindrical cup-shaped member surrounding said bellows, means attaching he open end of the cupshaped member and the open end of the bellows together in a fluid tight manner so as to form a sealed space between the bellowsand cup-shaped member, means including hollow connecting means extending from the fluid pressure. generator through the open end at the bellows ma; securedtotbeclosedendtherebtsaidlastrv. citedmeansmaintainingitfixeddlstancebetwecn the generatorand the closed end or the bellows andplacingtheinterlorolthegeneratorincommunication with the sealed space, whereby upon heaflngotthegeneratorbytheelectrlcheater' 

